canvas文本居中对齐_如何使用文本对齐来居中图像：居中
canvas文本居中对齐
An <img> element is an inline element (display value of inline-block). It can be easily centered by adding the text-align: center; CSS property to the parent element that contains it.
<img>元素是一个内联元素( inline-block显示值)。 通过添加text-align: center;可以很容易地将其text-align: center; 包含它的父元素CSS属性。
To center an image using text-align: center; you must place the <img> inside of a block-level element such as a div. Since the text-align property only applies to block-level elements, you place text-align: center; on the wrapping block-level element to achieve a horizontally centered <img>.
要使用text-align: center;来居中图像text-align: center; 您必须将<img>放置在块级元素(例如div 。 由于text-align属性仅适用于块级元素，因此请放置text-align: center; 在包装块级元素上实现水平居中的<img> 。
例 (Example)
<!DOCTYPE html>
<html>
<head>
<title>Center an Image using text align center</title>
<style>
.img-container {
text-align: center;
}
</style>
</head>
<body>
<div class="img-container"> <!-- Block parent element -->
<img src="user.png" alt="John Doe">
</div>
</body>
</html>Note: The parent element must be a block element. If it is not a block element, you should add display: block; CSS property along with the text-align property.
注意：父元素必须是块元素。 如果不是block元素，则应添加display: block; CSS属性以及text-align属性。
<!DOCTYPE html>
<html>
<head>
<title>Center an Image using text align center</title>
<style>
.img-container {
text-align: center;
display: block;
}
</style>
</head>
<body>
<span class="img-container"> <!-- Inline parent element -->
<img src="user.png" alt="">
</span>
</body>
</html>Demo: Codepen
演示： Codepen
对象拟合 (Object Fit)
Once your image is centered, you might want to resize it. The object-fit property specifies how an element responds to the width / height of it’s parent box.
图像居中后，您可能需要调整其大小。 object-fit属性指定元素如何响应其父框的宽度/高度。
This property can be used for image, video, or any other media. It can also be used with the object-position property to get more control on how the media is displayed.
此属性可用于图像，视频或任何其他媒体。 它也可以与object-position属性一起使用，以更好地控制媒体的显示方式。
Basically we use the object-fit property to define how it stretch or squish an inline media.
基本上，我们使用object-fit属性来定义其如何拉伸或压缩嵌入式媒体。
句法 (Syntax)
.element {
object-fit: fill || contain || cover || none || scale-down;
}价值观 (Values)
-
fill: This is the default value. Resize the content to match its parent box regardless of the aspect-ratio.fill： 这是默认值 。 调整内容的大小以匹配其父框，而不考虑纵横比。 -
contain: Resize the content to fill its parent box using the correct aspect-ratio.contain：调整内容的大小以使用正确的宽高比填充其父框。 -
cover: similar ascontainbut often cropping the content.cover：与contain类似，但经常裁剪内容。 -
none: display the image in its original size.none：以原始尺寸显示图像。 -
scale-down: compare the difference betweennoneandcontainto find the smallest concrete object size.scale-down：比较之间的差异none和contain找到最小的具体对象的大小。
浏览器兼容性 (Browser Compatibility)
The object-fit is supported by most of the modern browsers, for the most updated info about compatibility you can check this out http://caniuse.com/#search=object-fit.
大多数现代浏览器都支持object-fit ，有关兼容性的最新信息，请访问http://caniuse.com/#search=object-fit 。
文献资料 (Documentation)
翻译自: https://www.freecodecamp.org/news/how-to-center-an-image-using-text-align/
canvas文本居中对齐